mirror of
https://github.com/MariaDB/server.git
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144 lines
3.5 KiB
C++
144 lines
3.5 KiB
C++
/* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/*
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Functions to read and parse geometrical data.
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NOTE: These functions assumes that the string is end \0 terminated!
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*/
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#include "sql_priv.h"
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#include "gstream.h"
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#include "m_string.h" // LEX_STRING
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enum Gis_read_stream::enum_tok_types Gis_read_stream::get_next_toc_type()
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{
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skip_space();
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if (m_cur >= m_limit)
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return eostream;
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if (my_isvar_start(&my_charset_bin, *m_cur))
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return word;
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if ((*m_cur >= '0' && *m_cur <= '9') || *m_cur == '-' || *m_cur == '+')
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return numeric;
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if (*m_cur == '(')
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return l_bra;
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if (*m_cur == ')')
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return r_bra;
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if (*m_cur == ',')
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return comma;
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return unknown;
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}
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bool Gis_read_stream::lookup_next_word(LEX_STRING *res)
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{
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const char *cur= m_cur;
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skip_space();
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res->str= (char*) cur;
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/* The following will also test for \0 */
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if ((cur >= m_limit) || !my_isvar_start(&my_charset_bin, *cur))
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return 1;
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/*
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We can't combine the following increment with my_isvar() because
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my_isvar() is a macro that would cause side effects
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*/
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cur++;
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while ((cur < m_limit) && my_isvar(&my_charset_bin, *cur))
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cur++;
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res->length= (uint32) (cur - res->str);
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return 0;
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}
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bool Gis_read_stream::get_next_word(LEX_STRING *res)
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{
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skip_space();
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res->str= (char*) m_cur;
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/* The following will also test for \0 */
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if ((m_cur >= m_limit) || !my_isvar_start(&my_charset_bin, *m_cur))
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return 1;
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/*
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We can't combine the following increment with my_isvar() because
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my_isvar() is a macro that would cause side effects
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*/
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m_cur++;
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while ((m_cur < m_limit) && my_isvar(&my_charset_bin, *m_cur))
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m_cur++;
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res->length= (uint32) (m_cur - res->str);
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return 0;
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}
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/*
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Read a floating point number
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NOTE: Number must start with a digit or sign. It can't start with a decimal
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point
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*/
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bool Gis_read_stream::get_next_number(double *d)
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{
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char *endptr;
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int err;
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skip_space();
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if ((m_cur >= m_limit) ||
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((*m_cur < '0' || *m_cur > '9') && *m_cur != '-' && *m_cur != '+'))
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{
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set_error_msg("Numeric constant expected");
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return 1;
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}
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*d = my_strntod(m_charset, (char *)m_cur,
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(uint) (m_limit-m_cur), &endptr, &err);
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if (err)
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return 1;
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if (endptr)
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m_cur = endptr;
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return 0;
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}
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bool Gis_read_stream::check_next_symbol(char symbol)
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{
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skip_space();
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if ((m_cur >= m_limit) || (*m_cur != symbol))
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{
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char buff[32];
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strmov(buff, "'?' expected");
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buff[2]= symbol;
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set_error_msg(buff);
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return 1;
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}
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m_cur++;
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return 0;
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}
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/*
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Remember error message.
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*/
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void Gis_read_stream::set_error_msg(const char *msg)
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{
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size_t len= strlen(msg); // ok in this context
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m_err_msg= (char *) my_realloc(m_err_msg, (uint) len + 1, MYF(MY_ALLOW_ZERO_PTR));
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memcpy(m_err_msg, msg, len + 1);
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}
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